/*************************************************************************\
*                  Copyright (C) Michael Kerrisk, 2018.                   *
*                                                                         *
* This program is free software. You may use, modify, and redistribute it *
* under the terms of the GNU General Public License as published by the   *
* Free Software Foundation, either version 3 or (at your option) any      *
* later version. This program is distributed without any warranty.  See   *
* the file COPYING.gpl-v3 for details.                                    *
\*************************************************************************/

/* Listing 57-4 */

/* us_xfr_cl.c

   An example UNIX domain stream socket client. This client transmits contents
   of stdin to a server socket.

   See also us_xfr_sv.c.
*/

#include "us_xfr.h"

int
main(int argc, char *argv[])
{
    struct sockaddr_un addr;
    int sfd;
    ssize_t numRead;
    char buf[BUF_SIZE];

    sfd = socket(AF_UNIX, SOCK_STREAM, 0);      /* Create client socket */
    if (sfd == -1)
        errExit("socket");

    /* Construct server address, and make the connection */

    memset(&addr, 0, sizeof(struct sockaddr_un));
    addr.sun_family = AF_UNIX;
    strncpy(addr.sun_path, SV_SOCK_PATH, sizeof(addr.sun_path) - 1);

    if (connect(sfd, (struct sockaddr *) &addr,
                sizeof(struct sockaddr_un)) == -1)
        errExit("connect");

    /* Copy stdin to socket */

    while ((numRead = read(STDIN_FILENO, buf, BUF_SIZE)) > 0)
        if (write(sfd, buf, numRead) != numRead)
            fatal("partial/failed write");

    if (numRead == -1)
        errExit("read");

    exit(EXIT_SUCCESS);         /* Closes our socket; server sees EOF */
}